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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d200bd44376692c40306b926589d533065844e937b6a05c7af6671265fe46dc' 
  AND token = 'H5LuHRjJUjjmQ8/2Hq+Qsp8qSoy51EExJq1tqMG2QwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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