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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff69eb73581b9618e2f2b4d983861ee042b54bb7cc8a85f935f845ad099ece2' 
  AND token = 'YXMd0OygdcT3E2ChWeg3hR3+Oy/A9lpPWOyW8YObl+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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