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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea10391740b8f3a7b8e2da7cfe7f74088dbf0cbeee4bf565d8cb6db83651982' 
  AND token = 'fj4KrzF44xESr7d+7SpbQUCPpThb+zdnBlCNe6dx8SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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