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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da7d71d5c1172e79ec94613d15ac42f1795fbedd639f2b7e564bdee332ffb10' 
  AND token = 'fHN42AY3frJz4nkzRSJtBUGjrQsU51pfdfrS79GKAKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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