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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b0094055a91c3374ca5041daa14ac15e551626447891b6f9be5c1dada27929' 
  AND token = '5TB3ldKpRRYmy24Lr6ltzyuVccXTabenVuObXL+/2Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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