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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae48be8159d49811515ba223c498fbff405b4f4be1487b5565c860bd2552b962' 
  AND token = '9ZzBc8pkjsOzc20Ud4E53KYMTkyn0Fz/dyBuAlGQyik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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