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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3ed4442b7531d0578cd0817369347a8b74c4cada626343b85420267bc48e7f' 
  AND token = 'k881poxtV+gPMhhqU5zi1SjFOZn7P6+ecPax/9+5YxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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