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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82978bde8337184f38ba81165c2043c1c2693ae9677e9a936b3e9712f6eae61a' 
  AND token = 'bN8vP0T3aAdj9YJx9cO4W13kcJEP5UMVBWeyjD4+OkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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