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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c87a07b92358d3e8d6f053da89e83b0238112eedf87e6032ed5132cf0a10840' 
  AND token = 'dOVLE1CbUIECf70vnkf18og52J0NFZMjnyx4a9g/N1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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