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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3dd04029584c01f0b2f4490fa3ff80197ec0e3c5a8d2cd3d379a9302f70e8d' 
  AND token = 'qocDWqk1H/MxxWZcs4nO+jIyWQqocz3xSdst/3jdaQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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