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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ebe59c72e2af62b151bc7e4b155f21ebdd236a8984a596f4c8bb9fb55cf55a' 
  AND token = 'WF2sHOaByRVzCLGVTbTz6/SKnJn1A5PLP0V7UX7ECVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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