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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242c00da3af71537f2ce6e49681c03c4c62812dca47edecb24835a7902fb338d' 
  AND token = 'mUChzMysQ30KmI0+jupZwGUE8xTJBFZjnPaIT2BUWak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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