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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'effa0806818d1671db1b3e909a6e5d1d94ecc9d76da43bb9f34d28d4d8978b66' 
  AND token = 'O8fqgFPisUpogm4JjkrcW43TzKLq3vh6Y0Pkcq81M90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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