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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26689722fb25bf33874aed4387b60563f1a9b217391ead2422513d1a0dbad2a2' 
  AND token = 'SlKK11QWkDLyQ4rZsr71xh90oN/+t7fjgLStP58/r50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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