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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d690f36e80030c206d62c88261a2ac2196dc927a8c52b6bd0a6f806f63e5f4a' 
  AND token = 'H+W6Dk0az9tLCcAa0vjN8ZF5YBZpmyKjjNR+3egTqoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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