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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dbbe667cea38acd8fecb244e3d747c5b60505847754c2dadbde7817fc0fd6f' 
  AND token = 'V4dVlk6LzdLlZEpsfJan1RSToFIgaDzQtQg0Vd5Vcg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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