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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead5a3ae6d55d25b8afce30cfa8d4119fdd79e8bb624029ce5ad6a3391016b73' 
  AND token = 'ZPjvXpan7PuTzEahJ0tW4gSLnFTU1eD0zH5BfYfQic0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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