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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d6b7a5f8a81702b5b305550402eebbadebab648f0e7b8e0650ea9fe0577e12' 
  AND token = '/GF2SasIK2S921Qx0O9cobMLpFv29egGzQmssqGw8Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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