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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7607f7656943b22445275369de1d850354cbb75033a38aa75b249051c75c6d2c' 
  AND token = 'bF2ULV7LY9fvftxPhivJ2giPRhd1YL14bboI/1eOr+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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