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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937c2ccb263e076f426101670c0f7dce61bdbbd50315a36db045fb7e9dbaba83' 
  AND token = 'B9kaGMq4ac85D3hMTA2+2foH5HxV+u9nfqFunARhoT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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