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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97078805ca8d7ac6d399507f2357fb3e72750d9a3181ecd01c23b7a3250edfc1' 
  AND token = 'fKjngq9FGNKfks4Yd4x8e5h53ePA9sxxUHQNb53hw+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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