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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6422a9db3d224e22f11c9ec9850dff36d4bff0c54efa464a3aa5525e4c14c2' 
  AND token = 'rxH5FjkB+C/4UrJa4m0giffjwO9FhG6VFoTjkiPNEvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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