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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32c375969e4fb35c4aa866ce037f916ac4477b857161fb42469f4a9a25c9812' 
  AND token = 'kpiyCCzg0tMj16pV5vamX4llmReFOxs3QGy9mgEaqV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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