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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e13ba2e469241cb8d898cd27d5a6b9057e044e6c2fac292e92e9dbc6fd54d8' 
  AND token = 'kZ42fUbeb1VA6k4dR9ZNHX26yntLKrbYOUo0qRbqgV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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