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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b28da8e96eb12563cfa0fc23dbd8f97bab121b92265e347c274f4b6e6d38a0a' 
  AND token = '/Wxmlj9vUttGppSC9GSp2uf6AnWgVSpdAmB/E1KXbfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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