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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c8c83a8fc2cd0af024e8356a86af70861308c4f9d2dc3b86e509f38089f157' 
  AND token = 'uTVYtsSDOdcLKwGtLrPcl77DHCe3gCDpTYpYVitt1hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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