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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6552634c33365b8d659eb36fae153ef9b60e6e4ffda539b88f37e7c569f8a4d' 
  AND token = 'Z3glNSxEBoCA4nOCI+deAIlsAY5GMa1uTuMzut7mQ6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}