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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cb32bc60a94f0832fbd1431458ce2253c7031886fc319f17127d178ca88e77' 
  AND token = 'kvAzGj11ja11qc9z69u0V9CpEAIULYA7Q/4jEip16uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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