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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d792010c2a7f41a6e9a0788cacf5e446d6d063ea6b129d498b29445464c3ee' 
  AND token = 'pQiqFX4She9nwQrm5XU5/HBEr0BKfZJAmEevg2bxqSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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