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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30730eee769628ad6e95060f48b5146ef9bf59c1d46a16666f8b78ecb718d5cb' 
  AND token = '+YaOB0tHw1Z8K8CtGZkCtpMF6BDIisswhXliRWOlx2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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