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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ca3fb69a58be21b6f7e1d87b7389e59171faaae29b678863797eeb210b93bc' 
  AND token = 'x9ndcLS3doenftegYFelwTddisEZAXE/O+zl4l4P690=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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