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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1772f259ec79239c311ec66b7a0515ea02a2af7f952dc17e65594205b4b9e1d6' 
  AND token = '51UKwKgX9zr45xkqPrag9WewNbJ9xNAApgR8ZobYra0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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