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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0298a6bb7a761597f03cfc511d58bb1aaef0447de420155764264e954f571ad9' 
  AND token = 'Z5rCpqOoHwwI4Lkr1mfr9perFTIdOvRpb67PsnVUrlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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