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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a45459c4c83af7b64b8d0dbe01de417ba680eeddafe3ebb76740f24942dcaa3' 
  AND token = 'lp9iIc5cgCBNH/rw9tq3YUd+KNWn+295Emp3M2EFY0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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