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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc934f01d64aeecb1289bea32d1364e1c8b6487f1618b608e72efe9c2fe20e39' 
  AND token = 'DRM39EhTRVKNpP8px3rKehk2y1rku5YtU6UJ18QH0kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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