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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5acfae32cbe0d60c5466e8786e69e0ca303c68e7e6d704cc187187617c209f7' 
  AND token = 'kdri0evRq/8W04F14tlb0McaZH1J4DlxCWvMRhWkxzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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