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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae505be5b6d7885223ac9c990a6b6dc59849322d665010981fba78e05818d155' 
  AND token = 'GZ1XBcKiIec8Rtve7a604/uL7hn7ZGbdLBANwNGooFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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