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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93eb1adc4d2084c762d878015b4d14834ca8d173683bd8579791711c397499b' 
  AND token = 'O7jU+Z9o443Ch0A3ZC7S+0f4l/hj8vTihmNdamkghyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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