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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b7948e445c3a8784c2ba76ed18c36b34154aac307fba5a702f514620383c54' 
  AND token = 'acWN6c/0mvIrx3ElZWjx61rTRh9l1YLbN300/k8QSNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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