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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1436371ab6c82bb5fade9b03be0d6a4c095d5b8d1a434a5efea25e9ad9053e7a' 
  AND token = 'AOSKs9M8bsL7Wp9xbFQEhvdiFVh2LlOfZFL6ZudDISY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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