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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5a267eac00bd24120ae5644bffb6fc1c8665d605d5ae2e72ef1c0a892bb2f4' 
  AND token = '06quD0Co7m5DUaKbtWsGfdDDUlKfU3LBDMpdxsQ6STw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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