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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfb914cf066a65d16d9de770d74959c8c0d4e8c222452d2adceae7c69e7d2f0' 
  AND token = 'sSbSZDnOk/EPl5b2pp/cyy/b3YehwriCore5DmJs3GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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