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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1035e8abe1f6994eab3b438cfae41147fa145c8f0f33818a47b5f6b49847ca' 
  AND token = 'yJ0EyvRxPMI7gEHpFIkuJni2Za2/5qeh4Nhl0kKDGto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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