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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936ae2a9f9a693e2dde7ff7f814bf012fe6fac9a7617833b6af44a7cbe637476' 
  AND token = 'UgF38OSy/8KSvwGyiwgjU4S83JmGtNawWzN7DDXOvJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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