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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45736c0d125d258616926a2300992cd03b299d40c7829e4abddfafa298035da4' 
  AND token = 'QMW/Fz2YbVXYQxdrCeUijh50jRbVX4H9339IMtezt4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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