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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a894060bd7a45e09cc36d7a8499423ca5a9e2a0839b40328847641ad831b65f0' 
  AND token = 'alaXat4u+k01VtUCtNDd9YTykXnO+/ydONOUuvxS2xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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