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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dd43ec070f39dd6fa5aefc176146b9c97f487e7f8086c2a34f28b91ce6bc5d' 
  AND token = '+uGiz3uLkevM9/HFAM9lPtMvZXvcrhr13f1/9/Fj7PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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