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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c012b693149c6a54b4def5ac8c43d38529d6ad3cdd63f26fb07dafa44db40431' 
  AND token = 'UQn/JkXazTu7iUJn7a587MGEZ3S/ReQf6VSj6HZ0hGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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