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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c96247cbc38e2aa8c99fa00b33d2ecc297c031b58ca1f2a3ea8947271bfeb33' 
  AND token = 'KoTyO29+HUxOjSMtn406eERpGS66QCI+xfhXNKe9l4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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