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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ec45cd85bef9621bfed1c68dc9cb99271e157acaaf04ef1cbc14ec6358ee53' 
  AND token = 'JoaJwCqzinyNixQFUW533sgXCNrrnKMUn8wBR1su6WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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