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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9191b2535ca56b2dfaf8d5089df5fa1e47d7572a3a90634087670a5c48856c42' 
  AND token = '0el5EoyGoebxomhCCEl5nzOLLhm74mjMr42EIuVQX4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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