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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc15d55e9ff42a7c892c5a94198ebd2361cca629d38b0b1667c705da880ced1' 
  AND token = 'Fe2fqX5ABIMgx1UctTBP5UX8zODJ2wB1lW3VtpFrIdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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