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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0da19af78d27f247da7cd483731b5c2da047c797b13ceae169e1abc304ef711' 
  AND token = 'cGvZI/hNDTH7mbPJ5SM5FGgQWmeTVTMywQSQH1TQGJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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