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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f62d3ea45649af21b7fd81947eba47b5432192eb5288db89c9c6dd49fc1e16' 
  AND token = '51RC8yur3hqlXEmJ2/1DNcqSwcgsEArpJQWrUe96osI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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