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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f87a686d8867e955e24498a7b382f6139a44ff8f03b95e937f69004867e47e' 
  AND token = 'cawZeN53APDlf8PcLx8D6H+lO8QJVLa5epM0gXIZPOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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