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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684cc63bcac1ee242a7f429e4bb1f69716b850dc2e240621f2f70938fc9c6ac2' 
  AND token = 'ctntSUTEBQONguMgyS3oE8lAhYxHg3ntCTaTN4718/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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