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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7a1ca25e1704ec142c162c84073f3560702c2a3e6fbcefbcfcb91230b9f30e' 
  AND token = 'WoH4wX2nzvMsMcO3FMlIzYNhzP3o+sckgi7lavpPOuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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