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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfcc307625ab8e738e36c78e7da9540549b4004813c50a1db17913edbe5cccc' 
  AND token = 'u31mmg4Ee4kHW57UoO3zL9ut5fEEq925AFjdkpT5evo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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