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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8232946bfe6681f53bd19269ae77dd1cf10064be4f4dede092a16c8339c381' 
  AND token = '7afuxFOwrrsCs7eFdDILKWsZ5sBQa2XcxY7pxEHvYk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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