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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68a3a63736b9ba962e18bb1e37012a661cdab6bb0b592f0176560eb577f89e5' 
  AND token = 'ciY3tFnjA/52YE7JWpHhFgUTE9HNhYq94s/4zS/XHy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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