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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e93ee8f754016ea89b279867c48c6011757a26eb379c5d96be167b66ebe3c44' 
  AND token = '1gGnkEp7+XQ06eAdU93DPaU5KRUv0Oytk5lXAbNUWDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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