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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe0510f44c25d8a091f60423ffb00c4656171c81c7122c2ec44dcac151eab50' 
  AND token = '7asH5mRWzoB6Y0SP5BbKR+CJRXnHQWcfDz6E2Wde9JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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