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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe603b2841985f7614d173b9b3e9e771048a6d98eff98a78e219fc1fac84c598' 
  AND token = 'qhCpJB5bfDqSIw/mfsyvjvFn1qhtsfU0dcM1dVh+A+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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