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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c534dbf6e474b393520d9f389fb880aab65b9f07d716268a44b11d51b105e1f' 
  AND token = '8prmRdUz71pv2rRP4mwSXRfLuhTkfmfZX0CtsR2tgKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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