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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a7d9093c208578748ba14b1e5a140f44e4338dc834daf6877d2baef8492d26' 
  AND token = 'QkjjmaoGVnw3mv8eFOvgHhy5Wh4NUdtMna+CpuXmg3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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