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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619a359ec0bda41dbf044e72910c042f9b2672bb8d509c594503d0fa92889b15' 
  AND token = 'lwWwqWvtkwp+Oa9JmYuEEwjqXptMXDE0ptFlnaN0q/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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