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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6d7f29f50201eac181134b6e0e34c88da6c65eff1f145e80abcb32892b172a' 
  AND token = '06a5lhK5RS5FuD8EhBYuotVXpcJU2jHG1xEmbbtv0yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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