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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40fc44905d2860942a92aeb9893698f77769c006756c2078bc5422f6710544f' 
  AND token = '+IxfMr9uUAalCLM0tWALCpZuq7DKcm4MHpuLkCt1bMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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